In major keys, the major 7th
(MM7) chords are built
on scale degrees
[?] and

There are four qualities of triads that appear in major and minor scales, each with ... doing so uses Roman numerals to designate the scale degree of the chord's root. ... In major keys, chords with the same Roman numeral are made.

Explanation:

where is the image at? ?

c. shubert i think : )